If she hasnt laid them all in 3 days I would worry but yes normally they lay 20 to 50 eggs in a few hours time.
I would seek a veterinarians advice on this. she may need some help.
If she becomes overly tired, turns gray or seems to be pushing with no eggs coming out you need to see a vet right away.
Many iguanas die because they are egg bound and there is very short time to seek help.